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Investments - Fair Value, Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cost | $ 1,803,609 | $ 1,792,304 | [1]
Fair value | $ 1,760,030 | $ 1,754,039 | [2]
Investments at Cost and Fair Value | Investment Portfolio Concentration |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Percentage of Investment Portfolio | 100.00% | 100.00% |
Senior secured first lien debt |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cost | $ 1,638,995 | $ 1,564,891 | [1]
Fair value | $ 1,579,512 | $ 1,526,989 | [2]
Senior secured first lien debt | Investments at Cost and Fair Value | Investment Portfolio Concentration |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Percentage of Investment Portfolio | 90.30% | 91.60% |
Senior secured second lien debt |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cost | $ 41,036 | $ 55,455 | [1]
Fair value | $ 38,769 | $ 38,583 | [2]
Senior secured second lien debt | Investments at Cost and Fair Value | Investment Portfolio Concentration |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Percentage of Investment Portfolio | 2.20% | 2.30% |
Collateralized securities and structured products - equity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cost | $ 2,687 | $ 3,885 |
Fair value | $ 1,179 | $ 2,998 |
Collateralized securities and structured products - equity | Investments at Cost and Fair Value | Investment Portfolio Concentration |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Percentage of Investment Portfolio | 0.10% | 0.20% |
Unsecured debt |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cost | $ 30,427 | $ 26,777 | [1]
Fair value | $ 22,643 | $ 26,616 | [2]
Unsecured debt | Investments at Cost and Fair Value | Investment Portfolio Concentration |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Percentage of Investment Portfolio | 1.30% | 1.60% |
Equity |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cost | $ 79,595 | $ 53,379 | [1]
Fair value | $ 107,058 | $ 70,936 | [2]
Equity | Investments at Cost and Fair Value | Investment Portfolio Concentration |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Percentage of Investment Portfolio | 6.10% | 4.30% |
Investments, Excluding Short-Term Investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cost | $ 1,792,740 | $ 1,704,387 |
Fair value | 1,749,161 | 1,666,122 |
Short term investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cost | 10,869 | 87,917 | [1]
Fair value | $ 10,869 | $ 87,917 | [2]
[1] | Represents amortized cost for debt securities and cost for equity investments.
[2] | Fair value determined in good faith by the Company’s board of directors (see Note 9) using significant unobservable inputs unless otherwise noted.

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